#ifndef MYCAL_H
#define MYCAL_H
#include <QString>
#include "widget.h"
#include <cmath>
#include <cstdio>
#include <QStack>

double cal(QString str);

int youxj(char c);

double jisuan(double a,double b,char c);

double sjisuan(double a,char b);

#endif // MYCAL_H
